The CYSA-S Signature League was established for those recreational players that have developed a higher level of soccer skill and competitive play. The current 2018-2019 season the Fullerton Rangers are represented by 18 teams, boys and girls under ages 9 through 15.

The Signature League is an advanced recreational league for youth and families designed to promote skilled soccer, good sportsmanship, fair play and a safe environment. The objective of the Signature League is to provide an intermediary playing level that better prepares players, parents and coaches for the transition from recreational play to competitive play.

The players are selected though try-out sessions held every year in April. The season begins in July, and games start in September. The games will be played on one of the Signature League designated fields.